Improvement in ventilators



W. B. BROWN.

Ventilator.

Patented June 17, I879 WI-TNESSE S f/Z JTX/w a M INVENTOR 2%;

ATTORNEYS.

MPETERS. PHOTO-LITHDGRAPHER. WASmNGTON, D c

UNITED STATES PATENT OEEIoE.

WILLIAM B. BROWN, 01? WHEAT RIDGE, OHIO.

IMPROVEMENT IN VENTILATORS.

Specification forming part of Letters Patent No. 216,650, dated June 17,1879; application filed March 21, 1879.

To all whom it may concern:

Be it known that I, WILLIAM BAKER BROWN, of Wheat Ridge, in the countyof Adams and State of Ohio, have invented a new and useful Improvementin Ventilators, of which the following is a specification.

Figure l is avertical section of my improved ventilator, taken throughthe line w as, Fig. 2. Fig. 2 is a front view of the same, partly insection, to show the construction.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish an improved device forremoving vapors, foul air, &c., from kitchens, school-rooms, and otherplaces, which shall be simple inconstruction and efiective in use.

The invention consists in an improved ventilator formed by thecombination of the hood, the pipe, the slat dampers, the connectingrod,the two cords, and the swivelcd tapering spiral with each other, toadapt the device to be applied to the ceiling of a room, as hereinafterfully described. j

A represents a hood, which is designed to be secured in an opening inthe ceiling of the room to be ventilated. The lower part of the hood ismade with vertical sides, and the upper part with inwardly-inclinedsides.

From the top of the hood A a pipe, B, leads into a stove-pipe, aventilating-flue, a chimneyflue, or outthrough the wall or roof.

In the lower part of the hood A is placed a number of slat-dampers, G,which are pivoted at the lower corners, of their ends to the lower partof the opposite sides of the hood A. The slat dampers G are connected atthe middle parts of their upper or free side edges by a rod or bar, D.To one end of the rod D is attached the end of a cord, E, which hangsdown in such a position that it maybe readily reached and operated by, aperson from floor of the room. To the other end of the rod D is attachedthe end of a'cord, F, which passes throughra hole in the hood A oraround a guide-pulley, and hangs down in such a position that it may bereadily reached and operated by a person from the floor.

With this construction, by drawing upon the cord E the slats G will beturned down into a horizontal position, closing the lower end of thehood A, and by drawing upon the cord F the slats G will be raised into avertical position, as shown in Fig. 1, opening the lower end of the hoodA.

To rods attached to the upper part of the hood A is swiveled the end ofa flat bar, G, coiled into a tapering or conical spiral, which isrevolved rapidly by the ascending current of air, and tends toaccelerate the upward movement of the said current.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- An improved ventilator formed by the combination ofthe hood A, the pipe B, the slat-dampers (J, the connecting-rod D, thetwo cords E F, and the swiveled tapering spiral G with each other, toadapt the device to be applied to the ceiling of a room, substantiallyas herein shown and described.

WILLIAM BAKER BROWN.

Witnesses HARVEY HUGHES, H. H. BROWN,

